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except when on part of the National System of Interstate and Defense Highways, the following maximum weights: 22,000 pounds on a single axle; 40,000 pounds on a tandem axle; 90,000 pounds gross weight on a 5-axle or 6-axle vehicle. Vehicles operating under this paragraph (13) are not subject to the bridge formula. (14) A vehicle or combination of vehicles that uses either natural gas or propane gas as a motor fuel or is operated by an engine fueled wholly or partially by an electric battery or hydrogen fuel cell electric fueling system may exceed the above weight limitations by up to 2,000 pounds, the total allowance is calculated by an amount that is equal to the difference between the weight of the vehicle attributable to the natural gas or propane or hydrogen gas tank, batteries, and fueling system carried by the vehicle, and the weight of a comparable diesel tank and fueling system. This paragraph (14) shall not allow a vehicle to exceed any posted weight limit on a highway or structure. (15) An emergency vehicle or fire apparatus that is a vehicle designed to be used under emergency conditions to transport personnel and equipment, and used to support the suppression of fires and mitigation of other hazardous situations on a Class I highway, may not exceed 86,000 pounds gross weight, or any of the following weight SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468